Returns the MIME type that is going to be included in the response via the Content-Type header, whether that has been set explicitly in the PHP code or if it's going to be based on the default_mimetype setting in php.ini.

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Returns the MIME type that is going to be included in the response via
the Content-Type header, whether that has been set explicitly in the PHP
code or if it's going to be based on the default_mimetype setting in php.ini.